Tony Blair's Hong Kong born sister-in-law will fly into the territory on the Prime Minister's jet to witness the handover.
Katy Blair Tse Kam-har, wife of the Prime Minister's brother, is a UK expert in banking law.
She and husband Bill have been invited to join the Prime Minister's party on the RAF jet which arrives here on Monday.
However, it is not clear whether they will be at the actual handover ceremony.
Yesterday Ms Blair said she had deep feelings for the place she grew up in and maintains a strong bond with family and friends, visiting the territory every year.
'Obviously it will be in everybody's interest that Hong Kong remains prosperous,' she said from the Chinese community centre she co-founded in London 11 years ago.
Although they were travelling with the Prime Minister, they would be paying for the trip themselves, she added.